Table 5.
Calculated elastic modulus, splitting tensile strength, flexural strength, peak bond stress, and calculated area under stress-strain plots for the control and TDA concrete with and without silica fume.
| Component | Control-0% TDA | 7.5% TDA -1′′ | 7.5% TDA -1′′-SF-A |
|---|---|---|---|
| Elastic modulus, psi (MPa) | |||
| At 28 days | 3.35E + 06 (2.31E + 04) | 2.72E + 06 (1.88E + 04) | 2.69E + 06 (1.85E + 04) |
| At 7 days | 2.69E + 06 (1.85E + 04) | 2.37E + 06 (1.63 + 04) | 2.13E + 06 (1.85E + 04) |
|
| |||
| Splitting tensile strength, psi (MPa) | |||
| At 28 days | 466 (3.2) ± 7.9% | 525 (3.6) ± 7.2% | |
| At 7 days | 466 (3.2) ± 17% | 431 (2.97) ± 6% | |
|
| |||
| Flexural strength (modulus of rupture), psi (MPa) | |||
| At 28 days | 570 (3.93) ± 10.7% | 535 (3.69) ± 2.7% | 480 (3.31) ± 6.9% |
| At 7 days | 602 (4.2) ± 10% | 550 (3.8) ± 7% | 464 (3.2) ± 12% |
|
| |||
| Pull-out test, peak bond stress, psi (MPa) | |||
| At 28 days | 1929 (13.3) ± 12.3% | 1890 (13.0) ± 14.3% | |
|
| |||
| Calculated area under stress-strain plots representing concrete toughness | |||
| At 28 days | 75.7 ± 31% | 215 ± 29% | 154 ± 15% |